JP2007138418A - Deck plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a deck plate which prevents a welding trace from being left on the undersurface of a metallic base. <P>SOLUTION: In the deck plate 10, a first protrusive streak 22 which is longitudinally elongated in a state of protruding upward from the top surface 18 of the metallic base 11 is formed on the metallic base 11 in such a manner as to be positioned on both lateral sides of a first reinforcement 13; the upper part 25 of a second reinforcement 14 is welded to the first reinforcement 13; a part 28 which cross the first protrusive streak 22 at two points of the lower part 27 of the second reinforcement 14 is welded to a first recess 22 in a state of being separated upward from the top surface 18 of the metallic base 11; and a part 29 which crosses a third reinforcement 15 of the intermediate part 26 of the second reinforcement 14 is welded to the third reinforcement 15. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a deck plate for constructing a slab of a steel structure building or a reinforced concrete structure.

  A deck plate is known which is constructed between slabs by laying between cross beams and placing concrete. As an example of the deck plate, a metal base having a predetermined area, a first reinforcing bar that is spaced upward from the upper surface of the metal base and extending in the vertical direction, and a wave-like bend in the vertical direction between the metal base and the first reinforcing bar. There are those provided with a pair of second reinforcing bars that extend in the vertical direction while repeating the above and a pair of third reinforcing bars that are arranged below the first reinforcing bars and that are spaced apart from each other and extend in the vertical direction. In such a deck plate, a portion where the upper ends of the second reinforcing bars are in contact with both sides of the first reinforcing bar and spot welded to the first reinforcing bar, and a portion intersecting with the third reinforcing bar in the intermediate part of the second reinforcing bar. Is spot welded to the third rebar. Further, the second rebar is spot welded to the metal base in a state where the lower end of the second rebar is in contact with the upper surface of the metal base. The metal base and the first to third reinforcing bars are usually made of iron. The upper and lower surfaces of the metal base are plated.

When the lower end portion of the second reinforcing bar is welded to the metal base, the heat effect during welding causes not only the upper surface of the metal base but also the lower surface to have a mark due to welding. Rather than detracting from the appearance of the deck plate, the weld mark on the lower surface of the metal base loses the plating applied to prevent corrosion and exposes the iron. is there. In order to solve these problems, there is a deck plate in which a metal base is further overlapped on the lower surface of the metal base and welding marks are hidden by pressing the metal bases (see Patent Document 1).
JP 2004-124518 A

  In order to conceal the welding traces, the deck plate disclosed in the above publication has to be overlapped with a metal base on the lower surface of the metal base, and press and press the metal bases together. Of course, the metal base material for that must be prepared separately.

  An object of the present invention is to provide a deck plate in which no welding marks are generated on the lower surface of the metal base, and it is not necessary to separately hide the welding marks using a material.

  The premise of the present invention for solving the above-mentioned problems is that a metal base having a predetermined area, a first reinforcing bar that is spaced upward from the upper surface of the metal base and extends in the vertical direction, and the metal base and the first reinforcing bar A pair of second reinforcing bars extending in the vertical direction while repeatedly bending in a wave shape in the vertical direction, the second reinforcing bars being between the upper part facing the first reinforcing bar, the lower part facing the metal base, and the upper and lower parts A deck plate having an intermediate portion extending.

  The feature of the present invention based on the above premise is that the pair of first protrusions projecting upward from the upper surface of the metal base and extending in the vertical direction are formed on the metal base so that they are located on both lateral sides of the first reinforcing bar, From the upper surface of the metal base, the upper part of the first reinforcing bar is welded to the first reinforcing bar, and the part of the lower part of the second reinforcing bar that intersects with the first protruding line is fitted into the first recessed part that is recessed downward from the upper end of the first protruding line. It exists in welding to this 1st recessed part in the state spaced apart upward.

  As another example of the present invention, the lower part of the second reinforcing bar bends laterally outward so that the lower part of the second reinforcing bar is parallel to the upper surface of the metal base, and intersects the first protrusion at two points. These portions intersecting the first protrusion are welded to the first recess in a state of being spaced upward from the upper surface of the metal plate while being fitted into the first recess of the first protrusion.

  As another example of the present invention, a pair of third reinforcing bars that extend in the vertical direction while being spaced apart from each other in the lateral direction are diverging outwardly from the upper part toward the lower part of the second reinforcing bar. The part which is arrange | positioned in the intermediate part and cross | intersects the 3rd reinforcing bar of the intermediate part of a 2nd reinforcing bar is welded to this 3rd reinforcing bar.

  As another example of the present invention, a pair of second protrusions that protrude upward from the upper surface of the metal base and extend in the vertical direction are positioned on either the laterally inner side or the laterally outer side of the first protrusion. The lower part of the second rebar that is formed on the metal base and bends laterally outward so as to be parallel to the upper surface of the metal base intersects the second protrusion at two points, of the lower part of the second rebar Those portions intersecting with the second protrusion are welded to the second recess in a state of being spaced upward from the upper surface of the metal base while being fitted into a second recess recessed downward from the upper end of the second protrusion.

  According to the deck plate according to the present invention, the portion of the lower part of the second reinforcing bar that intersects the first protrusion is inserted into the first recess, and the portion is spaced upward from the upper surface of the metal base. Since it is welded to the recess, the welded portion between the first recess formed on the metal base and the lower part of the second rebar is above the upper surface of the metal base, and not only on the upper surface of the metal base but also on the lower surface of the metal base. There will be no marks from welding. Since the deck plate does not cause welding marks on the lower surface of the metal base, not only does the appearance of the deck plate not be impaired, but it is also necessary to superimpose the metal base separately on the lower surface of the metal base in order to conceal the welding marks. There is no need to repair the bottom surface of the metal base to eliminate the weld mark. In the deck plate, since the first recess and the second rebar are welded with the lower part of the second rebar inserted into the first recess, the lower part of the second rebar is in contact with the first protrusion. Compared to the case where the first protrusion and the second rebar are welded, the metal base and the second rebar have a higher fixing strength, and the impact when the concrete is placed on the deck plate is affected by the metal base and the second rebar. Even if transmitted to, the metal base and the second rebar are not detached, and the strength of the reinforced concrete can be reliably maintained by the tension reinforcing function of the first rebar and the second rebar. In this deck plate, since the first protrusions suppress the vertical flexibility of the metal base, the vertical deflection and distortion of the metal base when concrete is placed on the deck plate can be prevented.

  The lower part of the second rebar that bends outward in the lateral direction intersects the first protrusion at two points, and the part of the lower part of the second rebar that intersects the first protrusion is inserted into the first recess, The deck plate welded to the first recess with the portion spaced upward from the upper surface of the metal base is welded to the first recess at the two portions that intersect the first protrusion of the lower part of the second reinforcing bar. Therefore, compared with the case where the lower part of the second reinforcing bar is welded to the first recess of the first protrusion at one place, the fixing strength between the metal base and the lower part of the second reinforcing bar can be further increased. . The deck plate is welded to the first recess with the portions intersecting the first protrusion at two locations spaced upward from the upper surface of the metal base, and the welded portion between the first recess and the lower portion of the second rebar is Since it is above the upper surface of the metal base, there is no trace of welding on the upper and lower surfaces of the metal base.

  A pair of third rebars are arranged in the middle part of the second rebar, the second rebar spreads outward in the lateral direction as it goes from the upper part to the lower part, and is spaced apart and opposed in the horizontal direction. The deck plate in which the portion of the intermediate part intersecting with the third reinforcing bar is welded to the third reinforcing bar is attached to the intermediate part of the second reinforcing bar in addition to the first reinforcing bar. The rigidity can be increased and the strength of the reinforced concrete can be increased by the tension reinforcing function of the first to third reinforcing bars.

  The lower part of the second rebar that bends outward in the lateral direction intersects the second ridge at two points, and the part of the lower part of the second rebar that intersects the second ridge fits into the second recess, The deck plate welded to the second recess with the part spaced upward from the upper surface of the metal base, the part of the lower part of the second rebar that intersects the first protrusion at two locations is fitted into the first recess. Further, since the portions of the lower part of the second reinforcing bar that intersect with the second protrusion at two places are welded while being fitted into the second recess, the metal base and the lower part of the second reinforcing bar The fixing strength can be further increased. In this deck plate, the welded portion between the first and second recesses and the lower part of the second rebar is located above the upper surface of the metal base, so that not only the upper surface of the metal base but also the lower surface of the metal base is marked by welding. There is no. In this deck plate, not only the first ridge but also the second ridge suppresses the vertical flexibility of the metal base, so the vertical deflection and distortion of the metal base when concrete is placed on the deck plate. Can be surely prevented.

  The details of the deck plate according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view of a deck plate 10 shown as an example. 2 and 3 are a front view of the deck plate 10 and a top view of the deck plate 10, and FIGS. 4 and 5 are partially broken side views of the deck plate 10 and a part of the lower part of the second rebar 14. FIG. 5 is an enlarged view of FIG. 1-4, the vertical direction is indicated by an arrow A (excluding FIG. 2), the horizontal direction is indicated by an arrow B (excluding FIG. 4), and the vertical direction is indicated by an arrow C (excluding FIG. 3). The deck plate 10 is formed of a vertically long metal base 11 having a predetermined area and two vertically long reinforcing bar units 12 positioned on the metal base 11 and arranged in the horizontal direction. Each reinforcing bar unit 12 is assembled from one first reinforcing bar 13, two second reinforcing bars 14, and two third reinforcing bars 15.

  The metal base 11 has both side portions 16 extending in the vertical direction and both end portions 17 extending in the horizontal direction, and has a substantially flat upper surface 18 and lower surface 19. The metal base 11 is made of an iron plate, and the upper and lower surfaces 18 and 19 are plated. In addition, there is no limitation in particular in the area of the metal base 11, The area can be freely set with the magnitude | size of the slab to construct | assemble. Further, the metal base 11 can be made of a metal other than iron. As shown in FIGS. 1 and 2, a first engagement portion 20 that bends upward from the upper surface 18 of the base 11 and a second engagement portion that bends downward from the lower surface 19 of the base 11, as shown in FIGS. 21 is formed. By hooking the second engagement portion 21 on the first engagement portion 20, the plurality of deck plates 10 can be connected to each other and arranged in the lateral direction.

  The metal base 11 is formed with a plurality of protrusions 22 (first protrusions) protruding upward from the upper surface 18 thereof. The protrusions 22 are located on both lateral sides of the first reinforcing bar 13 and extend on the metal base 11 in the vertical direction. In each of the reinforcing bar units 12, two ridges 22 are formed in the horizontal direction. The ridge 22 is formed by bending a part of the metal base 11 inward in the lateral direction, and partially folding the part of the base 11 upward from the upper surface 18, and the lower surfaces 19 of the base 11 are not spaced apart from each other at the mountain folded part. It is made by pressure welding.

  The protrusion 22 has a predetermined height dimension L in the vertical direction, and as shown in FIGS. 4 and 5, the side surface has a strip shape, and as shown in FIG. Presents a linear shape. Although there is no limitation in particular in the height dimension L of the up-down direction of the protrusion 22, The preferable range of the height dimension L is 5-50 mm. The protrusion 22 has a recess 24 (first recess) that is recessed from the upper end 23 toward the upper surface 18 of the metal base 11. The recess 24 does not reach the upper surface 18 of the metal base 11 and is spaced apart from the upper surface 18 of the base 11 by a predetermined dimension. Therefore, a part of the protrusion 22 extends between the upper surface 18 of the metal base 11 and the recess 25.

  The first rebar 13 extends straight from the upper surface 18 of the metal base 11 with a predetermined distance upward in a vertical direction. The first rebar 13 is disposed between both end portions 17 of the metal base 11. The third rebar 15 extends straight from the upper surface 18 of the metal base 11 in the vertical direction with a predetermined distance upward. The third reinforcing bars 15 are arranged between the metal base 11 and the first reinforcing bar 13 and between both end portions 17 of the metal base 11 so as to be positioned below the first reinforcing bar 13 and on both sides in the lateral direction of the reinforcing bar 13. Has been.

  The second reinforcing bar 14 is located between the metal base 11 and the first reinforcing bar 13 and repeatedly bends (undulates) in a wave shape in the vertical direction. The second reinforcing bars 14 are arranged symmetrically in the lateral direction with the first reinforcing bar 13 in between. The second rebar 14 has an upper part 25 and a lower part 27 and an intermediate part 26 extending between the upper and lower parts 25, 27. As shown in FIG. 2, the second reinforcing bar 14 is inclined at a predetermined angle with respect to the metal base 11 so as to spread laterally from the upper part 25 toward the lower part 27. As shown in FIG. 4, the upper portion 25 is arc welded upward, and is spot-welded to the first rebar 13 in a state where it abuts on both lateral sides of the first rebar 13. As shown in FIG. 3, the lower portion 27 is bent outward in the lateral direction so as to be parallel to the upper surface 18 of the metal base 11, and forms an arc outward in the lateral direction. The lower part 27 protrudes laterally outward from the ridge 22 and intersects the ridge 22 at two points. A portion 28 of the lower portion 27 that intersects the protrusion 22 is spot-welded to the recess 24 while being fitted into a recess 24 formed in the protrusion 22 and spaced apart from the upper surface 18 of the metal base 11 by a predetermined distance. ing. The third rebar 15 abuts against the intermediate portion 26 of the second rebar 14, and a portion 29 of the intermediate portion 26 of the second rebar 14 that intersects the third rebar 15 is spot welded to the third rebar 15. .

  Although not shown in the spot welding, the first to third reinforcing bars 13, 14, 15 are sandwiched between electrodes, a high voltage is applied to the electrodes to heat and melt the reinforcing bars 13, 14, 15, and then the reinforcing bars The steel bars 13, 14, and 15 are naturally cooled, and the reinforcing bars 13, 14, and 15 are welded to each other at the welding points. Also, in order to weld the portion 28 of the lower portion 27 of the second rebar 14 that intersects the protrusion 22 and the recess 24, the metal base on which the protrusion 22 extends after the portion 28 is placed on the protrusion 22. The electrode is arranged on the lower surface 19 of 11 and the electrode is arranged above the second rebar 14. Next, the metal base 11 and the lower part 27 of the second rebar 14 are sandwiched between the electrodes, and a high voltage is applied to the electrode to heat the ridge 22 formed on the metal base 11 and the portion 28 of the second rebar 14. After melting, the metal base 11 and the second rebar 14 are naturally cooled, and the portion 28 and the recess 24 of the second rebar 14 are welded to each other at the welding location. Here, when the protrusion 22 is heated with an electrode, the protrusion 22 melts from the upper end 23 toward the upper surface 18 of the metal base 11, and a recess 24 is formed in the protrusion 22. Weld together.

  In the reinforcing bar unit 12, the thickness of the first to third reinforcing bars 13, 14, 15 is not particularly limited, and the thickness of the reinforcing bars 13, 14, 15 is set according to the size of the slab to be constructed and the strength required for the slab. It can be set freely. The metal used for the first to third reinforcing bars 13, 14, and 15 is preferably iron, but metals other than iron can also be used. Further, when iron is used for the reinforcing bars 13, 14, 15, the reinforcing bars 13, 14, 15 may be subjected to anticorrosion treatment such as plating. There are no particular limitations on the number of times the second rebar 14 is bent per unit length (m) and the angle of inclination with respect to the metal base 11, and the number of times of bending and the angle of inclination can be freely set.

  The deck plate 10 is used for constructing a slab. For example, both ends 17 of the rebar unit 12 are placed on a horizontal beam with the rebar unit 12 facing up, and the bridge plate is bridged between the horizontal beams. To cast. Since the deck plate 10 can sufficiently withstand the weight of the placed concrete, there is no need for a support member that supports the lower surface of the metal base 11, and there is no need to assemble the support member or dismantle the support member after placing the concrete. It becomes. Further, the deck plate 10 can increase the strength of the reinforced concrete by the tension reinforcing function of the reinforcing bar units 12. In the deck plate 10, since the protrusions 22 suppress the vertical flexibility of the metal base 11, it is possible to prevent vertical deflection and distortion when concrete is placed on the deck plate 10.

  In this deck plate 10, a lower portion 27 of the second rebar 14 that bends outward in the lateral direction intersects the ridge 22 at two points, and a portion 28 of the lower portion 27 of the second rebar 14 intersects the ridge 22. The portions 28 are welded to the recess 24 in a state of being inserted into the recess 24 and spaced upward from the upper surface 18 of the metal base 11, so that the welded portion between the lower portion 27 of the second rebar 14 and the recess 24 is the metal base. 11 and the upper surface 18 of the metal base 11, and not the upper surface 18 of the metal base 11 but also the lower surface 19 of the base 11 is not marked by welding. Since the deck plate 10 does not cause weld marks on the lower surface 19 of the metal base 11, not only does the appearance of the deck plate 10 be impaired, but the metal base is separately provided on the lower surface of the metal base 11 in order to conceal the weld marks. It is not necessary to superimpose the metal base 11 on the lower surface 19 of the metal base 11.

  In the deck plate 10, since the concave portion 24 and the second reinforcing bar 14 are welded in a state where the lower portion 27 of the second reinforcing bar 14 is fitted in the concave portion 25, the lower portion 27 of the second reinforcing bar 14 is simply in contact with the protrusion 22. Compared to the case where the second rebar 14 and the ridge 22 are welded in this state, the fixing strength at the welded portion is large, and the impact when the concrete is placed on the deck plate 10 is affected by the metal base 11 and the second rebar. 14, the base 11 and the second reinforcing bar 14 do not come off, and the strength of the reinforced concrete can be reliably maintained by the tension reinforcing function of the first to third reinforcing bars 13, 14, 15.

  6 and 7 are a perspective view and a front view of the deck plate 30 as another example, and FIGS. 8 and 9 are a top view of the deck plate 30 and a lower portion 27 of the second rebar 14. FIG. 6 is an enlarged view similar to FIG. 6 to 8, the vertical direction is indicated by an arrow A (except for FIG. 7), the horizontal direction is indicated by an arrow B, and the vertical direction is indicated by an arrow C (except for FIG. 8). The deck plate 30 is different from that shown in FIG. 1 in that not only the first protrusion 22 but also the second protrusion 31 is formed on the metal base 11, and other configurations are the same as those of the deck plate 10 of FIG. Therefore, the description of other structures is abbreviate | omitted by attaching | subjecting the code | symbol same as FIG.

  The metal base 11 is formed with a plurality of first protrusions 22 and a plurality of second protrusions 31 protruding upward from the upper surface 18 thereof. The first protrusions 22 are located on both lateral sides of the first rebar 12 and extend on the metal base 11 in the vertical direction. The second protrusions 31 are located on both lateral sides of the first reinforcing bar 12 and laterally outward of the first protrusions 22, and extend on the metal base 11 in the vertical direction. The second ridge 31 may be formed inward in the lateral direction of the first ridge 22. In each of the reinforcing bar units 12, two first ridges 22 and two second ridges 31 arranged in the lateral direction are formed. The protrusions 22 and 31 are formed by bending a portion of the metal base 11 inward in the lateral direction, partially folding the portion of the base 11 upward from the upper surface 18, and the lower surfaces 19 of the base 11 at the mountain-folded portions. It is made by pressure-contacting without gaps.

  These ridges 22 and 31 have predetermined dimensions in the vertical direction, and as shown in FIG. 9, the side surface has a strip shape, and as shown in FIG. 8, the shape viewed from above is substantially linear. Presents. It is preferable that the vertical dimension L of the protrusions 22 and 31 is in the range of 5 to 50 mm. The first protrusion 22 is formed with a first recess 24 that is recessed from the upper end 23 toward the upper surface 18 of the metal base 11, and the second protrusion 31 is recessed from the upper end 32 toward the upper surface 18 of the metal base 11. A second recess 33 is formed. The first and second recesses 24 and 33 are spaced apart from the upper surface 18 of the base 11 by a predetermined dimension without reaching the upper surface 18 of the metal base 11. Therefore, part of the protrusions 22 and 31 extends between the upper surface 18 of the metal base 11 and the recesses 24 and 33.

  The lower part 27 of the second reinforcing bar 14 protrudes laterally outward from the ridges 22 and 31 and intersects the ridges 22 and 31 at two points. A portion 28 of the lower portion 27 of the second reinforcing bar 14 that intersects the first protrusion 22 is inserted into the first recess 24 formed in the protrusion 22 and is spaced upward from the upper surface 18 of the metal base 11. And spot welded to the recess 24. A portion 34 of the lower portion 27 of the second reinforcing bar 14 that intersects the second protrusion 31 is inserted into the second recess 33 formed in the protrusion 31 and is spaced upward from the upper surface 18 of the metal base 11. And spot welded to the recess 33. The procedure of welding the portion 34 intersecting the second protrusion 31 of the lower portion 27 of the second reinforcing bar 14 and the second recess 33 is the same as that for welding the first recess 24 and the portion 28.

  The deck plate 30 is welded while the portions 28 intersecting the first protrusions 22 of the lower portions 27 of the second reinforcing bars 14 bent outward in the lateral direction are fitted into the first recesses 24, Since the portion 34 intersecting with the second protrusion 31 of the lower portion 27 of the second reinforcing bar 14 bent outward in the lateral direction is inserted into the second recess 33 and welded, the metal base 11 and the first The fixing strength at the welding location with the lower part 27 of the two reinforcing bars 14 can be further increased. In the deck plate 30, the welded portion between the first and second recesses 22 and 33 and the lower portion 27 of the second reinforcing bar 14 is located above the upper surface 18 of the metal base 11, and not only the upper surface 18 of the base 11 but also the base 11. There is no welding mark on the lower surface 19. In the deck plate 30, not only the first protrusion 22 but also the second protrusion 33 suppresses the vertical flexibility of the metal base 11, so that the vertical deflection when the concrete is placed on the deck plate 30 Distortion can be reliably prevented.

  In these illustrated deck plates 10 and 30, two pairs of reinforcing bars 12 formed from the reinforcing bars 13, 14, and 15 are arranged on the metal base 11, but the number of reinforcing bar units 12 is limited to two. Instead, three or more sets of reinforcing bar units 12 may be formed on the metal base 11.

The perspective view of the deck plate shown as an example. FIG. 2 is a partially cutaway side view of the deck plate of FIG. 1. The top view of the deck plate of FIG. The side view of the deck plate of FIG. The enlarged view of FIG. 4 which fractures | ruptures and shows a part of lower part of the 2nd reinforcing bar 14. FIG. The perspective view of the deck plate shown as another example. The front view of a deck plate. The top view of a deck plate. The enlarged view similar to FIG. 5 which shows a part of lower part of a 2nd reinforcing bar, and a part of protrusion.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Deck plate 11 Metal base 12 Reinforcement unit 13 1st reinforcing bar 14 2nd reinforcing bar 15 3rd reinforcing bar 18 Upper surface 19 Lower surface 22 Projection (1st projection)
23 upper end 24 recess (first recess)
25 Upper part 26 Middle part 27 Lower part 28 Part 29 Part 30 Deck plate 31 Second protrusion 32 Upper end 33 Second recessed part 34 Part

Claims (4)

A metal base having a predetermined area, a first reinforcing bar that is spaced upward from the upper surface of the metal base and extending in the vertical direction, and a vertical bending while repeatedly bending in a wave shape between the metal base and the first reinforcing bar. A deck including a pair of second reinforcing bars extending in a direction, the second reinforcing bars having an upper portion facing the first reinforcing bar, a lower portion facing the metal base, and an intermediate portion extending between the upper and lower portions. In the plate
A pair of first protrusions projecting upward from the upper surface of the metal base and extending in the vertical direction are formed on the metal base so as to be located on both lateral sides of the first reinforcing bar, and the upper part of the second reinforcing bar is The metal base is welded to the first reinforcing bar, and a portion of the lower part of the second reinforcing bar that intersects with the first protrusion is fitted into a first recess recessed downward from the upper end of the first protrusion. A deck plate, wherein the deck plate is welded to the first recess while being spaced apart from the upper surface of the plate.   The lower part of the second rebar is bent laterally outward so as to be parallel to the upper surface of the metal base and intersects the first protrusion at two points. The first of the lower parts of the second rebar 2. The deck according to claim 1, wherein the portions intersecting with the protrusions are welded to the first recesses while being fitted in the first recesses of the first protrusions and spaced upward from the upper surface of the metal plate. plate.   A pair of third reinforcing bars extending in the vertical direction in a laterally opposite manner are disposed in the middle part of the second reinforcing bars, the second reinforcing bars spread outward in the lateral direction as they go from the upper part to the lower part, The deck plate according to claim 1 or 2, wherein a portion of the intermediate part of the second reinforcing bar that intersects with the third reinforcing bar is welded to the third reinforcing bar. A pair of second protrusions that protrude upward from the upper surface of the metal base and extend in the vertical direction are positioned on either the laterally inner side or the laterally outer side of the first protrusion. The lower part of the second rebar that is bent in the lateral direction so as to be parallel to the upper surface of the metal base intersects the second protrusion at two points, and the lower part of the second rebar Those portions intersecting with the second protrusion are welded to the second recess in a state of being spaced upward from the upper surface of the metal base while being fitted into the second recess recessed downward from the upper end of the second protrusion. The deck plate according to claim 2 or claim 3, wherein

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